Eoradiolites davidsoni, lower valve
Bob Campbell Geology Museum Formation: Fredericksburg Formation.
Ammonite (Desmoceras sp.)
Bob Campbell Geology Museum 110 million years old; Donated: H. Abercrombie.
Fossilized excrement (Coprolite)
Bob Campbell Geology Museum 85 million years old; Formation: Pierre Shale.
Tympanotonus cretaceus, matrix-filled shell
Bob Campbell Geology Museum Formation: Cerro del Pueblo Formation.
Ammonite (Placenticeras sp.)
Bob Campbell Geology Museum 70 million years old; Formation: Bearpaw Shale.